Source: Amazon

As the company that has toppled numerous industries en route to becoming the fastest-ever firm to eclipse $100 billion in sales, Amazon (AMZN -1.44%) has a long history of being the aggressor in virtually every situation.

Rarely does the world's most dominant e-commerce giant find itself on its heels. However, that's exactly the position Amazon has found itself in as the firm struggles to further deepen its presence in India due to a recent regulation from the government.

Regulatory ruckus
Last month, the Indian government's Ministry of Commerce & Industry issued a new set of rules relating to the amount of involvement foreign e-commerce companies can have with online retail firms in India.

India has long maintained protectionist policies toward foreign ownership of retail companies within the country. It's the reason global retail powers like Apple and Wal-Mart, to name a few, are forced to partner with local companies to distribute their products in the world's second most populous country. However, it remained unclear whether e-commerce sites like Amazon were subject to the same restrictions as physical retailers like Apple. This left Amazon and other global e-commerce firms operating in a state of relative uncertainty or limbo, until now that is. With last month's ruling, the Indian government officially ruled that e-commerce sites like Amazon can indeed be legally owned by foreign firms.  

However, adding yet another layer of complexity to the situation, the government mandate also forbids e-commerce companies from having 25% or more of their revenue come from a single seller, a threshold that Amazon's Indian operations unfortunately violates. Amazon claims its marketplace helps facilitate e-commerce operations for over 80,000 third-party sellers in India alone. Unfortunately, a single firm called Cloudtail is believed to singlehandedly produce between 40%-50% of Amazon's e-commerce sales in India, putting the firm on the losing end of the recent regulation.

To be clear, analysts believe Amazon's India business faces little threat of an immediate crackdown, though the new law reportedly went into effect immediately. However, this latest ruling speaks to the frustrating and at times nebulous realities that can occur as leading U.S. firms seek growth abroad.

Worth the headache
If you think this seems odd and labyrinthine, I'm right there with you. However, it also stands beyond dispute that likely long-term rewards will more than compensate for these intermittent headaches.

Last year, total online sales in India were estimated to have reached $12 billion. For context, India currently enjoys only about 10% Internet penetration, according to McKinsey & Co. data. However, as Internet access and average incomes rise in coming years, the Indian online retail market is expected to grow 44% annually to $75 billion in sales by 2020. In fact, the sheer infancy of the India e-commerce market speaks to why Amazon remains one of the most obvious growth stocks to own for the next generation in my eyes.

Like India, the global e-commerce market remains also in its infancy. Consider this. According to data from eMarketer, global retail sales topped $22 trillion in 2014, of which only an estimated $1.3 trillion came from e-commerce businesses like Amazon. Again, Amazon's own sales exceeded $100 billion for the first time ever last year, a veritable drop in the bucket. Perhaps because names like Amazon have existed in the consumer consciousness for so long, we tend to think of e-commerce as a relatively established market, and it is to an extent. However, taking several steps back, a more holistic analysis shows that e-commerce, even presently, remains very much in its infancy.

Not everything can or should be sold online. However, any time you refer to a potential market using the descriptor "multi-trillion dollar," it likely offers plenty of growth potential, especially for an industry leader like Amazon. So while potential regulatory obstacles like the one above can appear confounding or frustrating, such instances remains only a small subset of the truly mammoth long-term business opportunity enjoyed by Amazon and its investors.